What does a nature do in Pokémon?

A nature raises one stat by 10% and lowers another by 10%. HP is never affected, which is why the chart is 5×5 rather than 6×6. Five of the 25 natures (Hardy, Docile, Bashful, Quirky, Serious) raise and lower the same stat, so they leave every stat unchanged.

Nature Chart for Pokémon: All 25 Natures | Random Pokémon Generator

Pokémon nature chart: rows are the stat raised by 10%, columns are the stat lowered by 10%.
+10% ↓ / −10% →	Atk	Def	Sp. Atk	Sp. Def	Spe
Atk	Hardy	Lonely	Adamant	Naughty	Brave
Def	Bold	Docile	Impish	Lax	Relaxed
Sp. Atk	Modest	Mild	Bashful	Rash	Quiet
Sp. Def	Calm	Gentle	Careful	Quirky	Sassy
Spe	Timid	Hasty	Jolly	Naive	Serious

Nature	Raises	Lowers	Likes	Dislikes
Hardy	—	—	—	—
Lonely	Attack	Defense	Spicy	Sour
Brave	Attack	Speed	Spicy	Sweet
Adamant	Attack	Sp. Atk	Spicy	Dry
Naughty	Attack	Sp. Def	Spicy	Bitter
Bold	Defense	Attack	Sour	Spicy
Docile	—	—	—	—
Relaxed	Defense	Speed	Sour	Sweet
Impish	Defense	Sp. Atk	Sour	Dry
Lax	Defense	Sp. Def	Sour	Bitter
Timid	Speed	Attack	Sweet	Spicy
Hasty	Speed	Defense	Sweet	Sour
Serious	—	—	—	—
Jolly	Speed	Sp. Atk	Sweet	Dry
Naive	Speed	Sp. Def	Sweet	Bitter
Modest	Sp. Atk	Attack	Dry	Spicy
Mild	Sp. Atk	Defense	Dry	Sour
Quiet	Sp. Atk	Speed	Dry	Sweet
Bashful	—	—	—	—
Rash	Sp. Atk	Sp. Def	Dry	Bitter
Calm	Sp. Def	Attack	Bitter	Spicy
Gentle	Sp. Def	Defense	Bitter	Sour
Sassy	Sp. Def	Speed	Bitter	Sweet
Careful	Sp. Def	Sp. Atk	Bitter	Dry
Quirky	—	—	—	—

How to read the Pokémon nature chart

Rows are the stat raised by 10%, columns are the stat lowered by 10%, and the cell where they meet is the nature that does both. Adamant sits at row Attack, column Sp. Atk — it raises Attack and lowers Sp. Atk. The diagonal is where a nature raises and lowers the same stat, which cancels out.

How much does a nature actually change a stat?

Roughly 30 points at level 100 on a well-invested stat. A Pokémon with 100 base Speed, 31 IVs, and 252 EVs reaches 299 Speed with a neutral nature, 328 with a Speed-boosting one, and 269 with a Speed-lowering one. The multiplier applies to the final stat, so the higher the stat, the more the 10% is worth.

That also means a nature is worth far less on a stat you aren't investing in. On an untrained stat the same 10% is only a few points, which is why a "wrong" nature matters most on the stat a Pokémon is built around.

Which nature should you pick?

The usual approach is to lower the offensive stat the Pokémon doesn't use:

Physical attacker — Adamant (+Attack, −Sp. Atk) for damage, or Jolly (+Speed, −Sp. Atk) to move first.
Special attacker — Modest (+Sp. Atk, −Attack) for damage, or Timid (+Speed, −Attack) to move first.
Wall or support — Bold (+Defense, −Attack) or Calm (+Sp. Def, −Attack), since neither needs its Attack stat.
Trick Room — Brave or Quiet, which lower Speed on purpose so the Pokémon moves first under reversed turn order.

To see the exact numbers a nature produces on a specific Pokémon, put it into the stat calculator — it applies the same multiplier the games do, at whatever level, IV, and EV spread you enter.

Natures and berry flavors

Each stat is tied to a flavor: Attack to Spicy, Defense to Sour, Speed to Sweet, Sp. Atk to Dry, and Sp. Def to Bitter. A nature likes the flavor of the stat it raises and dislikes the flavor of the stat it lowers, and the five neutral natures like nothing in particular. This matters for Poffins, Pokéblocks, and Berries that confuse a Pokémon with a disliked flavor — not for battle stats.

Changing a nature after catching

Natures are fixed when a Pokémon is generated, but recent games let you work around that: Mints (Sword/Shield onward) change which stats a Pokémon's nature boosts and lowers while leaving the nature name — and therefore its flavor preferences — untouched. If you already have a Pokémon and want to know what it rolled for IVs, the IV calculator works backward from its current stats.